苦心孤诣苦心孤詣

kǔ xīn gū yì

Meaning

to make painstaking efforts (idiom); after much trouble; to work hard at sth

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Characters

苦kǔbitter; hardship, suffering艹古心xīnheart; mind; soul 孤gūorphaned; alone, lonely, solidary子瓜诣yìto reach; achievement, accomplishment讠旨